"Voting 92 percent of the time with the president, whether you support him or not, doesn't work here in North Carolina," Hagan says in the old footage.

"So Sen. Hagan, why do you vote with Obama 95 percent of the time?" asks a male narrator. www.youtube.com/watch?v=kuajJgmNnqA&feature=youtu.be

Hagan faces state Speaker Thom Tillis, a Republican. The race was initially seen as a top pick-up opportunity for Republicans, who need to gain six seats to win control of the Senate. But Hagan has held a narrow lead in every recent poll, and Democrats are outspending Republicans on the airwaves.

This ad is part of a $5.1 million television buy from Crossroads GPS, running from Sept. 30 through Election Day, according to a spokesman. The ad will run on both broadcast and cable in markets statewide.

Since the state's primary in May, Crossroads GPS has so far spent about $10 million in the Tar Heel State this cycle, with half spent on political ads and half spent on issue ads. The affiliated American Crossroads has spent $1.9 million on political ads in the state.

The race is rated Tilts Democrat by the Rothenberg Political Report/Roll Call.